Oil-well fishing-tool



Patented Dec. 6, |898.

B. D. THOMPSON.

UIL WELL FISHING TDUL.

(Application led Nov. 30, 1897.) (N0 Model.)

NITED STATES PATENT OFFICE.

BUROHARD D. THOMPSON, OF CYCLONE, PENNSYLVANIA.

OIL-WELL FISHING-Tool..

SPECIFICATION fornnnsr part of Letters Patent No. 615,589, datedDecember 6, 1898- Application filed November 30, 1897. Serial No.660,246. (No model.)

To @ZZ w/wm it may concern:

Beit known that I, BURCHARD D. THOMP-` SON, of Cyclone, in the county of`McKean and State of Pennsylvania, have invented certain new and usefulImprovements in Oil-Well Fishing-Tools; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use it, reference being had tothe accompanying drawings, whichform part of this specification.

This invention relates to oil-well fishingtools; and the object of thesame is to provide a simple and effective device for removing brokensections of sucker-rods and for automatically unscrewing the sections atone of the joints beneath the break, thus rendering it unnecessary toremove the whole of the rod remaining beneath the break in order to makethe necessary repairs.

The invention consists in the novel features of construction hereinafterfully described and claimed, and illustrated by the accompanyingdrawings, in Which- Figure l is a vertical sectional view of the tool.Fig. 2 is a similar View of a portion of the stay when extended, as inelevating a broken rod. Fig. 3 is a cross-sectional view on line 3 3 ofFig. l.

The cylindrical casing A is closed at its lower end by block B and atits upper end by the longitudinally-bored internally-threaded head C.

D isaspirallythreaded rod working in head C, the same being provided atits lower end with knob E to en gagethe lowerfend of head C to preventits complete withdrawal, as shown in Fig. 2, and at the upper end of rodD is connection F of common form for uniting with a sucker-rod section.Rod D is apertured transversely to receive pin G just beneath head C, soas to hold the parts together when moving to operative position, thepins beinginsertedthrough opening Ain casing A.

Horn-socket H is provided at its upper end with the left-hand screwconnection I, which takes in a properly-threaded socket J, formed inblock B, and by this means the said socket is firmly secured to thevmain portion of the shing-tool.

When a break occurs in the sucker-rod, the

portion of the rod above the break is removed from the well-tubing andthe shattered rodsection is disconnected from the remaining section.Myimproved fishing-tool is then put in place upon the lower end of therod, with the horn-socket in proper position, and the whole inserted inthe tubing. The sucker-rod is lowered until the horn-socket nds theshattered end of the lower portion of the severed sucker-rod and may beiirmly united thereto by a few blows from a hammer upon the upper end ofthe rod in the operators hands. During this operation the pin serves tohold rod D lowered in casing A; but as soon as an upward pull is exertedupon the sucker-rod and communicated through it to the fishing-tool saidpin breaks and rod D ascends through head C. The threaded connectionbetween the rod and head causes the head and casing A to turnto theleft, as the threads of said connection are right hand. The whole weightof the lower portion of the sucker-rod remaining in the well is exertedwhen drawn upward upon to cause it to revolve, as will be understood,with the effect that said remaining portion will disconnect at one ofits joints and most usually at the rst joint below the fishing-tool, or,in other words, at that joint uniting the shattered section and thesection neXt below it.

The spiral of rod D is formed of a greater number of convolutions thanare necessary to sufficiently rotate the casing and hornsocket todisconnect the rod-section, so that the latter will be sure todisconnect at one of its joints. After the shattered rod-section hasbeen removed the withdrawn sections may be reinserted and united withthose remaining in the tube, such union being usually a comparativelyeasy matter. If, however, difficulty should'be encountered in unitingthe sections, the fishing-tool may be used for withdrawing the lowermostpart, so that the sections may be coupled above ground, as will beunderstood.

The left-hand-thread connection between the horn-socket and the toolproper is simply made tighter' by the rotation of the tool, as whenbeing raised, so that the whole tendency of the rotating tool is tounscrew the rod-section beneath it and tighten the joints above it.

ICO

I am aware that a device has been constructed with a spiral rod carryingat its lower end a threaded cap adapted to be operated under the weightof the tools above for forcing a screw-tap into an oil-well valve andafter being forced therein to withdraw the valve from the well. Myinvention diiers from this in that I have a left-hand spiral-threadedrod, whereby when a threaded nut is drawn up over the rod the rod isrotated to the left for unscrewing a broken section of a sucker-rod orsimilar parts of an Artesian well for removing the broken part andleaving the remaining portion in the well, and in that thescrew-threaded rod is provided with a hornsocket to embrace the brokenportion to be removed and adapted to be forced thereon by blows fromabove and then by an upward pull to revolve the horn-socket to the leftto unscrew the broken section, and which at the same time tends totighten all of the sections of the pipe or connection above my device.

Having thus fully described my invention,

what I claim, and desire to secure by Letters Patent, is

1. An oil-well fishing-tool comprising a tube carrying at its lower enda tube-embracing member, a screw-threaded block at its upper end, alongitudinally-movable rod within the socket, the rod and block having aleft-hand ed spiral thread, and a connection between the upper end ofthe rod for drawing the rod upward and thus rotating the two embracingmembers and the part embraced thereby to the left for unscrewin g itfrom the parts therebelow, substantially as described.

2. An oil-well shiug-tool comprising a tube having at its lower endablock with an upwardly-extending opening having a left-handed thread, ahorn-socket having a corresponding thread and tting therein, the upperend of the tube having a block provided with an opening, a rod passingthrough the said block, the rod and block having a spiral left-handedthread, the rod projecting through the block', and having a righthandthreaded projection,

Iblock, a rod having a corresponding thread passing through the blockwithin the tube and projecting beyond its upper end to receive a liftingconnection, the rod having an opening just below the block when it is inits inward position, and a pin passing through the said opening adaptedto hold the parts in a closed lposition when being inserted, the pinadapted to break under an upward pull to permit the rod to move throughthe block, substantially -as described.

at. An oil-Wellishing-tool comprisingatube having at its lower end atube-embracing member constructed to tightly embrace the tube by anendwise pressure or blow', the upper end of the tube having a block witha threaded opening, a rod passing through the opening and having acorresponding thread, the upper end of the rod projecting through theblock and having a shoulder thereabove for engaging the block whereby adownward pressure may be exerted upon the tube for forcing thetube-embracing member thereon, said extending end of the rod constructedto receive a lifting section or sections, whereby a downward pressurewill cause the tube-embracing member to tightly embrace the brokensection of the tube and an upward pull will rotate the tube-embracingmember for unscrewing the broken section to be removed, substantially asdescribed.

In testimony whereof I affix my signature in presence of two witnesses.

BUROHARD D. THOMPSON. Vitnesses:

HERMAN H. NORTH, JAMES GEORGE.

